feat: data query skill improvements

[akalautaro]

Summary

Improves the data-query skill based on a structured review of GPT and Gemini feedback — filtering valid suggestions from already-implemented or invalid ones, and migrating data-specific knowledge out of the skill prompt and into the canonical llm-index.

Changes

• Added interpretation layer: after returning results, Jarvis must add 1–3 sentences explaining the business meaning, trends, or anomalies
• Added ranking disambiguation rule
• Simplified channel disambiguation rule
• Added SQL guardrails: prohibit SELECT * and cartesian joins (no ON clause), also timeout for ad-hoc queries
• Updated Metabase URL edge case: Jarvis now attempts to resolve the backing dbt model via exposures.yml before falling back to the generic "can't access Metabase" message
• Removed specific table names from ambiguous questions table (already in llm-index routing table)

Testing

No functional code changes.

[coveralls]

Pull Request Test Coverage Report for Build 23821790852

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 26.227%

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Totals
Change from base Build 23812408657:	0.0%
Covered Lines:	236
Relevant Lines:	860

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💛 - Coveralls